百度提问 Peole often spend weekends playing in the park 句子中的play为什么加ing?

百度提问 Peole often spend weekends playing in the park 句子中的play为什么加ing? 百度提问 求翻译：Short peole often have better balance than tall people,so they do not fall over very often. spe是什么? 百度知道>提问 怎么在百度提问? 百度怎么提问 百度我要提问 百度如何提问 我的百度提问 百度怎么提问题 Often 怎么提问 就often 提问 often用什么提问? 百 度提问百度提问了 百度任务.我要提问. 想在百度里提问 怎么在百度上提问